Cooling is typically only done if you have a still air incubator. I'm not sure what type of incubator you have. With a forced-air model, you don't need to worry about cooling.
You will want to turn the eggs 180 degrees, three times a day minimum.
I think it helps to mist them with lukewarm water once a day from about day 10 or so until 24-48 hrs before pipping. My book says 24-48 hrs before hatching, but I've also read you shouldn't spray a pipped egg.
Stop turning 3 days before the hatch is due -- they are usually due at day 28.
I'm trying to remember, but I think incubation humidity is about 55%, and, yes, hatch humidity is 75%. You want to get that humidity up before they pip externally. Also, if you have washed the eggs the humidity needs to be higher than I have stated.
Once they pip externally it can take up to 36-48 hrs for them to hatch. They are slow to get the shell zippered.
First candling should be about day 7-10.
Edited for clarification.